[Zeke's Garage]

Are you still planning on having the front end/engine harness come through the firewall, or are you snaking it inside the fender?
You might just mount the block up inside the kick panel area where the fresh air vent is. You could also make a bracket to mount it facing down from behind the dash.
Anywhere else will cause you to have to splice in longer wires to everything in the engine bay and the dash.